/// <summary>
/// Attempts to fetch a FilterListEntry instance for the supplied category name, or create a
/// new one if one does not exist. Whether one is created, or an existing instance is
/// discovered, a valid, unique FilterListEntry for the supplied category shall be returned.
/// </summary>
/// <param name="categoryName">
/// The category name for which to fetch or generate a new FilterListEntry instance.
/// </param>
/// <returns>
/// The unique FilterListEntry for the supplied category name, whether an existing instance
/// was found or a new one was created.
/// </returns>
/// <remarks>
/// This will always fail if more than 255 categories are created!
/// </remarks>
private bool TryFetchOrCreateCategoryMap <T>(string categoryName, PlainTextFilteringListType listType, out T model) where T : MappedFilterListCategoryModel
{
m_logger.Info("CATEGORY {0}", categoryName);
MappedFilterListCategoryModel existingCategory = null;
if (!m_generatedCategoriesMap.TryGetValue(categoryName, out existingCategory))
{
// We can't generate anymore categories. Sorry, but the rest get ignored.
if (m_generatedCategoriesMap.Count >= short.MaxValue)
{
m_logger.Error("The maximum number of filtering categories has been exceeded.");
model = null;
return(false);
}
if (typeof(T) == typeof(MappedBypassListCategoryModel))
{
MappedFilterListCategoryModel secondCategory = null;
if (TryFetchOrCreateCategoryMap(categoryName + "_as_whitelist", PlainTextFilteringListType.Whitelist, out secondCategory))
{
var newModel = (T)(MappedFilterListCategoryModel) new MappedBypassListCategoryModel((byte)((m_generatedCategoriesMap.Count) + 1), secondCategory.CategoryId, categoryName, secondCategory.CategoryName);
m_generatedCategoriesMap.GetOrAdd(categoryName, newModel);
model = newModel;
return(true);
}
else
{
model = null;
return(false);
}
}
else
{
var newModel = (T) new MappedFilterListCategoryModel((byte)((m_generatedCategoriesMap.Count) + 1), categoryName, listType);
m_generatedCategoriesMap.GetOrAdd(categoryName, newModel);
model = newModel;
return(true);
}
}
model = existingCategory as T;
return(true);
}
/// <summary>
/// Constructs a new MappedFilterListCategoryModel instance.
/// </summary>
/// <param name="categoryId">
/// The generated category ID.
/// </param>
/// <param name="categoryName">
/// The category name.
/// </param>
public MappedFilterListCategoryModel(short categoryId, string categoryName, PlainTextFilteringListType listType)
{
CategoryId = categoryId;
CategoryName = categoryName;
ListType = listType;
}
